CN103412291A - Secondary-radar-based achieving method of target multipath effect suppression technology - Google Patents
Secondary-radar-based achieving method of target multipath effect suppression technology Download PDFInfo
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Abstract
The invention discloses a secondary-radar-based achieving method of a target multipath effect suppression technology. The method comprises the following steps that history trace point data are received and saved in real time, code matching is carried out, and period updating judgment is carried out after code matching is successful; target false judgment is conducted on updated new trace point data in a period according to multipath effect judgment criteria within the scanning period, data meeting requirements are reported, and data which do not meet the requirements are regarded as false trace point data and are discarded; initial target false judgment is rigidly conducted on new trace point data which are not updated in the period according to multipath effect judgment criteria within different scanning periods, data meeting requirements are reported, and data which do not meet the requirements are judged again. When being applied to a secondary ground radar and an airplane-mounted secondary radar, the secondary-radar-based achieving method can improve data quality of monitored targets and improves reliability and stability of a secondary radar system.
Description
Technical field
The present invention relates to the secondary radar communication technical field, relate in particular to a kind of implementation method based on secondary radar multipath effect inhibition technology.
Background technology
In complicated electromagnetic wave environment, to the supervision of airbound target radar once, secondary radar, ADS-B, the multiple supervision means such as ADS-X, these means complement one another, for the airflight targeted surveillance provides reliable information technology support, because the secondary radar cost is lower, can realize the advantages such as active probe, in the airbound target surveillance of whole spatial domain, secondary radar is all a kind of indispensable technological means, but owing to had a strong impact on by multipath effect, cause the quality of data of target seriously to reduce, how accurate, efficiently affected target being made true and false judgement and its false target is rejected is the difficult problem of this technical field.
Multipath effect typically refers to electromagnetic wave after ground surface or other reverberation surface reflection, harmful effect or interference that echo causes equipment.The detection performance of radar to aerial target that had severe jamming of multipath effect, therefore, the research of multipath inhibition technology has significant facilitation to the development of spatial domain radar target signal processing technology, especially the long term growth of domestic ground radar, onboard radar system is had to more profound significance.Recent two decades comes, and the research of primary radar multipath inhibition technology has been obtained to great achievement both at home and abroad, and successfully has been applied in the primary radar object detection field, yet the research of secondary radar multipath inhibition technology still is in to space state.
For the secondary radar technology of widespread use in prior art, be necessary to provide a kind of implementation method based on secondary radar multipath effect inhibition technology.
Summary of the invention
For addressing the above problem, the invention provides a kind of implementation method based on secondary radar multipath effect inhibition technology, comprise the following step:
Step 1: the flight path processing module is carried out code matches by new detection of a target point mark data and definite track history data, carry out step 2 if the match is successful, otherwise the new detection of a target is joined to non-definite track history data, completes these Targets Dots data and processes.
Step 2: judge whether new detection of a target point mark data are identical with the update cycle of definite track history data that the match is successful, carry out steps 3.1 if identical, otherwise carry out steps 3.2.
Step 3.1: the parameter that comprises distance, orientation of new detection of a target point mark data and definite track history data compares, as both differences, it in dependent threshold, is all real goal, report rear renewal to determine the track history data the new detection of a target, process thereby finish this detection of a target.
Step 3.2: the parameter that comprises amplitude and distance value of new detection of a target point mark data and definite track history data compares, as both differences, it in dependent threshold, is all real goal, report rear renewal to determine the track history data the new detection of a target, process thereby finish this detection of a target.Otherwise abandon data.
New detection of a target point mark data are not real goal, carry out steps 4 if judge in step 3.1: new detection of a target point mark data are compared with definite track history data, and the target that its range value is large is real newly-increased target.Report rear renewal to determine the track history data the new detection of a target, process thereby finish this detection of a target.Otherwise abandon data.
Beneficial effect of the present invention: by above-mentioned can be by because being subjected to the true and false target after Multi-Path Effects to make accurate judgement, and its false target data are rejected, while in ground secondary radar and airborne secondary radar, applying, can improve the quality of data that monitors target, strengthen reliability and the stability of secondary radar system.Method of the present invention is under the prerequisite that does not increase hardware cost, can greatly improve the detectability that is subjected to the Multi-Path Effects target, in complicated electromagnetic wave environment, the method is utilized true and false object judgement criterion, can judge in real time, exactly the degree of confidence of Targets Dots data, and according to the authenticity that is subjected to the Multi-Path Effects target, false target is rejected, can improve the secondary radar surveillance Targets Dots quality of data, strengthen aims of systems identification probability and reliability.
The accompanying drawing explanation
Fig. 1 is the processing flow chart of code matches in the present invention.
Fig. 2 suppresses the technical finesse process flow diagram with cycle and non-same cycle multipath effect in the present invention.
Embodiment
Below in conjunction with Figure of description, describe the specific embodiment of the present invention in detail.
The invention discloses a kind of implementation method based on secondary radar multipath effect inhibition technology, it specifically comprises following steps:
Step 1. flight path processing module receives and real-time keeping track of history point mark data (it can be divided into to definite track history data and non-definite track history data according to the effective degree of target response), new detection of a target point mark data and definite flight path can be carried out to code matches, and the code matches principle is: the identical and distance of detection of a target code is same target in certain dependent threshold.If the code matches success carry out step 2, otherwise new detection of a target point mark data are joined to non-definite track history data, complete this detection of a target and process.
The new detection of a target point mark cycle of step 2. is upgraded judgement.Judge whether new detection of a target point mark data are identical with the update cycle of definite track history data that the match is successful, if difference carry out step 3, otherwise will to target, carry out the falseness judgement in strict accordance with multipath effect judgment criterion in the same scan period.In the described same scan period, the multipath effect judgment criterion is: the large and little target of distance of range value is real goal.The new detection of a target point mark data that do not meet this judgment criterion are abandoned, determine the track history data to meeting the rear renewal of reporting of this judgment criterion, process thereby finish this detection of a target.
The new detection of a target point mark data of not upgrading in this cycle that step 3. proceeds to step 2 by different scanning in the cycle multipath effect judgment criterion be correlated with, its criterion particular content is: the distance in new detection of a target point mark data and definite track history data, Azimuth And Elevation are all real goal in dependent threshold necessarily.To relevant unsuccessful new detection of a target point mark data, will proceed to step 4 and carry out the judgement of next round false target, and report rear renewal to determine the track history data to the new detection of a target (being real goal) of being correlated with successfully, process thereby finish this detection of a target.
Step 4. is carried out last range value correlated judgment by the new detection of a target point mark data that step 3 proceeds to.Range value correlated judgment criterion: the target that range value is large is real newly-increased target.The new detection of a target that does not meet judgment criterion is abandoned, and what meet reports the non-definite track history data of rear renewal, and finishes this detection of a target and process.
Below to code matches criterion in the present invention, with the principle of multipath effect judgment criterion, different scanning multipath effect judgment criterion in the cycle in the scan period be elaborated,
In above-mentioned steps 1, the code matches criterion is: new detection of a target point mark data are compared with former definite historical flight path data, and the identical and distance of its object code is same target in dependent threshold necessarily.In the present embodiment, code matches is very important, a crucial step, and its matching result will be the judgement of the true and false property of the follow-up new detection of a target, and the correctness of rejecting because of the false target of Multi-Path Effects is established solid foundation.For secondary radar, in same air control area, the aviation management code of the detection of a target is to can be used as the unique identification of distinguishing aerial target, namely, when the aerial target aviation management code detected is identical, can think same target.More complicated along with the secondary radar applied environment, electromagnetic wave produces in communication process multipath effect is more and more serious, in existing practical engineering application, often find that the target of identical aviation management code in the same regulatory area caused because of multipath effect often exists; In addition, for the sports type platform (as airborne secondary radar) that is equipped with secondary radar, along with the variation of moving platform position, the probability that detects simultaneously the target of the identical aviation management code of different regulatory area improves greatly.For the consideration of above-mentioned situation, this kind based on the implementation method that the secondary radar multipath effect suppresses technology proposed more strictly, code matches criterion accurately, namely on the identical basis of original aviation management code, increase the judgement of Range-based condition.In practical engineering application, the improved code matches criterion of the present embodiment can be more effectively, accurately the detection of a target is mated.
Multipath effect judgment criterion in related same scan period in above-mentioned steps 2 is specially: new detection of a target point mark data are compared with definite track history data, and its range value is large and be real goal apart from little target.In secondary radar engineering application process, can often run into this kind phenomenon: secondary radar different scanning orientation within the same scan period can detect two targets that code is identical, and these two its distance values of target are also very approaching.For this phenomenon, engineering technical personnel have carried out the Back end data analysis to record data, passable the judging of comparing before and after these two targets: two targets, one is real goal, and another one is the false target because of Multi-Path Effects.So, formulate one reasonably, judgment criterion accurately, automatically, in real time, the true and false judgement the efficiently detection of a target in the same scan period made, and according to the final rejecting realized the false target because of Multi-Path Effects of its judged result.In the same scan period that the present embodiment proposes, the multipath effect judgment criterion just is being based on this kind thinking and is formulating, and this criterion judges that mainly the selection of the factor is that repeatedly Engineering Flight data and multipath effect are summed up and formed the specificity analysis of secondary radar detection of a target data influence over the years by combination.
The selecting range value is based on the consideration of electromagnetic wave received energy as the judgement factor, namely the real goal electromagnetic wave receives signal energy and necessarily is greater than the false target reception signal energy after Multipath reflection.The chosen distance property value is because the distance of the secondary radar detection of a target is directly proportional to the electromagnetic wave of its answer signal time of arrival as the judgement factor, for the target response signal that is subjected to Multi-Path Effects, its electromagnetic wave could arrive the secondary radar receiving end after the one or many reflection of reverberation surface, the electromagnetic wave of real goal answer signal is directly to arrive the secondary radar receiving end, from the time that both consume, certainly be subjected to the false target electromagnetic wave of Multi-Path Effects to be greater than real goal electromagnetic wave time of arrival time of arrival, namely within the same scan period, be subjected to the false target detection range of Multi-Path Effects necessarily to be greater than the real goal detection range.Through the engineering practice checking, show, the same scan period multipath criterion proposed by the present embodiment within the same scan period can be identified false target automatically, and efficiently by its rejecting.
Multipath effect judgment criterion in the different scanning cycle proposed in step 3 is specially: new detection of a target point mark data are compared with definite track history data, and its distance, Azimuth And Elevation are all real goal in certain dependent threshold.The principle of work essence of this step is to be correlated with and to find real goal in all definite historical flight paths by flight path, thereby realizes the rejecting of false target.Setting for position dependent threshold values such as distance, orientation, height can be adjusted according to mounting platform (mainly can be divided into motion and static platform), comparatively speaking, the setting of the associated gate limit value of equipment motion platform (as carrier aircraft, naval vessels etc.) need be considered the motion conditions of carrier aircraft itself, as roll, pitching, course and the speed of a ship or plane etc. in per moment of motion platform.
Further, for the target that does not reach different scanning multipath effect judgment criterion in the cycle in step 3, by the range value correlated judgment criterion of narrating in step 4, carry out again the next round judgement, be specially: new detection of a target point mark data are compared with definite track history data, and the target that its range value is large is real newly-increased target.This judgment criterion is mainly to solve while for moving target or equipment platform, turning, and great changes will take place for the positional information (as: distance, Azimuth And Elevation etc.) of the new detection of a target, with front period position information can't be associated, but the target situation of existence really again.
In the art, position is relevant can adopt various ways to carry out, such as setting corresponding threshold value, thinking in threshold range is correlated with successfully, thinking in threshold range is not correlated with unsuccessful, specifically adopting any mode to carry out the position person skilled can select according to needs, does not repeat them here.
Advantage of the present invention is:
The present invention judges the true and false target after Multi-Path Effects, and the false target that will be subject to Multi-Path Effects is rejected, while in ground secondary radar and airborne secondary radar, applying, can improve the quality of data that monitors target, strengthen reliability and the stability of secondary radar system.The present invention is under the prerequisite that does not increase hardware cost, can greatly improve the detectability that is subjected to the Multi-Path Effects target, in complicated electromagnetic wave environment, the method is utilized true and false object judgement criterion, can judge in real time, exactly the degree of confidence of Targets Dots data, and according to the authenticity that is subjected to the Multi-Path Effects target, false target is rejected, can improve the secondary radar surveillance Targets Dots quality of data, strengthen aims of systems identification probability and reliability.
Given coefficient and parameter in the present invention; be to provide to those skilled in the art and realize or use of the present invention; do not limit and only get aforementioned disclosed numerical value; without departing from the present invention in the case of the inventive idea; those skilled in the art can make various modifications or adjustment to above-described embodiment; thereby protection scope of the present invention do not limit by above-described embodiment, and it should be the maximum magnitude that meets the inventive features that claims mention.。
Claims (4)
1. an implementation method that suppresses technology based on the secondary radar multipath effect, is characterized in that, comprises the following step:
Step 1: the flight path processing module is carried out code matches by new detection of a target point mark data and definite track history data, if the match is successful, carry out step 2, otherwise new detection of a target point mark data are joined to non-definite track history data, complete these Targets Dots data and process.
Step 2: judge whether new detection of a target point mark data are identical with the update cycle of definite track history data that the match is successful, carry out steps 3.1 if identical, otherwise carry out steps 3.2.
Step 3.1: the parameter that comprises distance, amplitude of new detection of a target point mark data and definite track history data compares, as both differences, it in dependent threshold, is all real goal, report rear renewal to determine the track history data the new detection of a target, process thereby finish this detection of a target.
Step 3.2: the parameter that comprises the azimuth-range value of new detection of a target point mark data and definite track history data compares, as both differences, it in dependent threshold, is all real goal, report rear renewal to determine the track history data the new detection of a target, process thereby finish this detection of a target.Otherwise abandon data.
2. a kind of implementation method that suppresses technology based on the secondary radar multipath effect as claimed in claim 1, it is characterized in that, new detection of a target point mark data are not real goal if judge in step 3.1, carry out step 4: new detection of a target point mark data are compared with definite track history data, and the target that its range value is large is real newly-increased target.Report rear renewal to determine the track history data the new detection of a target, process thereby finish this detection of a target.Otherwise abandon data.
3. a kind of implementation method that suppresses technology based on the secondary radar multipath effect as claimed in claim 1 or 2, it is characterized in that in step 3.1 new detection of a target point mark data and definite track history data also need further to carry out the comparison of height value, is all real goal as distance, orientation, height value three difference in dependent threshold.
4. a kind of implementation method that suppresses technology based on the secondary radar multipath effect as claimed in claim 1 or 2, it is characterized in that, in step 1, new detection of a target point mark data and definite track history data code are after the match is successful, also need further to carry out the comparison of distance value, if distance value is real goal in dependent threshold.
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| CN106959441A (en) * | 2017-02-28 | 2017-07-18 | 中国电子科技集团公司第二十八研究所 | A kind of airport surface detection radar multipath false target flight path suppressing method |
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